All Converter Pro
在线调整图片尺寸
在线免费调整图片尺寸。设置宽度、高度或两者,保持宽高比,然后下载调整后的 JPG、PNG 或 WebP。无需注册,无水印。
关于此 图片尺寸调整 工具
The image resizer changes the pixel dimensions of a photo or graphic. Enter a width, a height or both: with the aspect ratio kept, the image is scaled to fit inside that size without distortion, and with it turned off the image is stretched to the exact size. Use it to meet the size limit of a form, shrink photos for email and chat, or prepare pictures for a website.
如何使用 图片尺寸调整
- 打开工具并添加您的文件、文字或数值。
- 检查可用选项,例如页面范围、输出格式、质量、密码或语言。
- 开始处理,并在完成前保持浏览器窗口打开。
- 下载结果,如有需要可继续使用相关工具。
实用提示
- 对于扫描的 PDF,支持 OCR 的工具会尽可能自动运行文字识别。
- 对于大文件,在通过邮件分享或上传到门户网站之前,请使用压缩工具。
- 为获得最佳效果,请上传扩展名正确的干净文件,避免使用损坏的文档。
常见问题
How do I resize an image without stretching it?
Enter only a width or only a height and leave the other empty. The tool calculates the missing side from the original proportions. If you enter both, keep the aspect ratio option on and the image is scaled to fit inside that box.
Will resizing reduce the file size?
Usually yes, because fewer pixels mean less data. For the smallest file, also lower the quality or choose WebP or JPG as the output format.
Can I make an image bigger?
You can enter a larger size, but enlarging cannot add detail, so the picture will look softer. Resizing down gives the best results.
Which formats are supported?
JPG, PNG, WebP, GIF, BMP, TIFF and iPhone HEIC photos are accepted. You can keep the original format or convert to JPG, PNG or WebP at the same time.
Is the image resizer free and private?
Yes. It is free with no account and no watermark, and uploaded files are stored only temporarily under random names before automatic cleanup.